Collet



Aug. 24 1926. 1,597,404

J. D. cRossLEY COLLET vFiled Sept. l2, 1925 S14/venlo@ Patented ugf24, 1926.

1,597,4tti i ooLLE'r.

Application inea september 12, i925. 'serial No. 56,071.

`In my Patent No. 1,438,021, dated lDe-i' Vmachine, in which a clutch, collet, gripping or feeding device vautomatically engages a piece of stock and intermittently advances the same, whereby pieces of the stock may be operated upon. or used for various purposes. My patent is particularly directed toa new article of manufacture in the form of a hollow piece of material having inbent walls providing lgripping members adapted to frictionally engage a piece of work between the gripping members, and this collet or clutch had its'gripping members formed by longitudinally slotting the walls of the collet so lthat `the material between the slots could be bentnwardly to provide the gripf ping members. p

The collet is especially designed for feeding stock hexagonal or octagonal in cross section, and it has been found in actual practice that now and then a collet is injured by having a piece of stock forced therein, with the result that the gripping members are excessively sprung, weakened or even kset so that the gripping members will no longer function for stock feeding purposes. If a piece of stock is properly inserted in the collet the gripping members engage the facets of the piece of stock and the slots between the gripping members provide clearance for the angles or corners formed by the facets of the piece of stock. But, sometimes the piece of stock is inserted wrongly, with the angles or corners impinging against thel gripping members and forcing the same outwardly to such an extent that the gripping members are unduly sprung and therefore have the resiliency thereof decreased, in time, for properly gripping the facets of a piece of stock.

To prevent a piece of stock from being wrongly placed in a collet or like device is the purpose of this invention, and the means which I employ to insure a correct position andV entrance of a piece of stock is applicable tovarious types of collets or feeding devices. Briefly, the means consist of opposed lips instruck from a collet with the lips so rigid that a wrongly positioned piece of stock cannot be forced between the lips, therefore it becomes necessary for a piece of stock to be correctly positioned relative to the lips,'with the result that itis correct- UNITED AsTAIri'LS PATENT. @FMC-*Enge* y,

JESSE ncnossLEY, 0E DETROIT, MICHIGAN.

ly positioned relative tothe gripping members of the collet.

My invention will be hereinafter specifically describedand then claimed, and referen'ce will now be'had toV the drawing, wherein-- i VFigure 1 is a side elevation of a 'colletin accordance withthis invention;

Fig. 2 is a longitudinal sectional view of the same; 4

Fig. 3 is a cross sectional view taken on` the line III-III, Figure 1;

Fig. 4'is a Asimilar rviewitalaen on 'the line IV-IV, Figure 2; i

Fig. 5 is a similar view taken on 4the line.

V-V of Figure 2;

Figure 6 is a plan of another form of collet in accordance with this invention; i

Fig. is an end view of ,the same; n L` Fig. 8 is a plan of another form of collet;

Fig. Slis a cross sectional view of the same;

Fig, 10 is a plan of still another form of collet, and

Fig. 11 is a cross sectional view of the same. v

Reference will first be had to Figures 1 to 5 inclusive, showing a collet made from a single piece of tubular material having a rigid inner end portion 1 exteriorly screwthreaded, as at 2, so that it may be attached to the pusher sleeve or other operation member of an automatic machine. The collet has an outer end portion 3 that may be longitudinally slotted, as at 4, or it may provide an uninterrupted circumferential wall, as shown in Figures 6, 8 and 10. Instead of a single slot, as shown in Figure 1, there may be a plurality of slots providing a well known form of collet. inoluding a multiplicity of gripping fingers.

Betweenthe inner and outer end portions l and 3, there are a plurality of longitudinal slots 5, and the material between said slots is inbent to form a plurality of longitudinally disposed resilient gripping members 6 which are adapted to engage the vfacets 7 ofa piece vof stock 8 extending through the collet. As

Stock is inserted with its cornersor angles 9 bearing against the gripping membersv 6 to the extent that said members are excessively sprung. To prevent this, I provide the inner end portion 1 ofthe collet with transverse slits l0, which are in opposed re-, lation, as best shown in Figures l and 2. The material between `the slits rlO- and the` Way in the collet prevents the gripping member 6 from. being excessively sprung and Worn.

Figures 8 to llinclusive show the lips vl1 in connection with Yother forms of 'collets, particularly a collet having opposed *longitudinal openings l2 and opposed longitudinal gripping members 13. y i

I attach considerable importance to the fact that the,V lips l1 constitute means )for r let having stock-engaging faces Vgripping members. l

correctly 1positioning a piecevof stock relative to the co letand that saidrmeans ,isv at the inner end ofthe collet and consequently prechicles anyinjury to the gripping members of the collet, Whetherl the same be intermediate-,the ends of the collet or at the outer end thereof. Y y Y While in the drawing there are illustrated the preferred embodiments of my invention,

'.it yis'to be understood that my invention is susceptible to such changesv asy are permissible by the appended claims.

lWhat I claim is z- *Y 1. As a new article of manufacture, ay coland its inner end provided With transverse slits with' the materialadjacent said slits bent,l inwardly to provide lips adapted to correctly position a piece of stock for engagement by the stock :engaging faces of the collet.

2. A collet comprising a tubular piece of material provided With longitudinalslots with the materialbetween said slots inbent `to form-gripping members,- and lips atthe inner end of said collet adapted to correctly guide a piece of stock for engagement by said 55 Intestimony whereof I affix my signature.

, I *'JESSELD. ACROSSLEY; 

